Malicious PDF — malware analysis report

Static analysis result for SHA-256 6716d14d723a9b9e…

MALICIOUS

PDF

94.0 KB Created: 2021-08-10 02:22:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b7df177f4cb73081940ba729d23c01c0 SHA-1: 21575b17bab3a85d9b8ab76c7670fd42ba53d8fb SHA-256: 6716d14d723a9b9ed38a5caf541468f56c7399829cdff168b77f1d2df12d79d7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as a malicious PDF by ClamAV and an ML classifier. It contains a link farm with numerous URLs pointing to potentially compromised WordPress sites and disposable hosting, suggesting a phishing or scam attempt. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a deliberate attempt to manipulate search engine results or distribute malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9932

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://chcial.ru/uplcv?utm_term=superman+returns+full+movie+in+hindi+filmyzilla PDF link annotation
    • http://guoyangmoju.com/userfiles/files/meruwaxomebiso.pdfIn PDF document text
    • http://elisa5888.com/shopadmin/upload/files/gudewipitinewaxuzazikabat.pdfIn PDF document text
    • https://vildmarksjagt.dk/userfiles/file/2952635997.pdfIn PDF document text
    • http://the-bom.kr/upfile/files/45374003529.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1607986c5dbfa2---26281378207.pdfIn PDF document text
    • http://sskj.pl/userfiles/file/75076488541.pdfIn PDF document text
    • http://tilestone-pools.com/i/File/wenubil.pdfIn PDF document text
    • http://studiotravenzolo.it/userfiles/files/22172837046.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ceb6b2a2d2a---rinibuzerutuzufoz.pdfIn PDF document text
    • https://betenagro.com/sites/default/files/file/78296557693.pdfIn PDF document text
    • https://www.aaptuk.org/ckfinder/userfiles/files/58758144106.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/r37cb4c57v5i8h7rolk77ee5uh/21086481358.pdfIn PDF document text
    • http://gayaarchi.com/userfiles/file/20210625040826.pdfIn PDF document text
    • http://thedewakohchang.com/image/upload/File/ovapiwewid.pdfIn PDF document text
    • http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/aelgb197608o361oo29qg4u131/posutufisezosoxunurim.pdfIn PDF document text
    • http://pinetreerealty.ca/clients/55933/File/tunuxulaterixaxu.pdfIn PDF document text
    • http://camionespanamericana.com/userfiles/file/86358025171.pdfIn PDF document text
    • http://szkolaprzybranowo.pl/ckfinder/userfiles/files/xinewuwegitejapur.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a7acffbfe49---duxemijobivajet.pdfIn PDF document text
    • http://phutungvespaco.com/luutru/files/wigamenotip.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160760445a1c37---xodowiwovoxugemezifezosu.pdfIn PDF document text
    • http://www.biogreeno.com/cms/ckfinder/userfiles/files/miditulixutimugorizelevat.pdfIn PDF document text
    • http://porpora.info/imagenes/imagenes_contenidos///rovowanes.pdfIn PDF document text
    • http://photo-preiss.com/upload_files/files/87996390984.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f21c6724da6---rosasux.pdfIn PDF document text
    • https://fundacionamigosdelmarcaribe.ong/ckfinder/userfiles/files/31068596071.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000101e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101E2 11176 bytes
SHA-256: 95d346eb05302543983fe1a10c9e70e440125e79027c1375c0383861dcc81c3e
font_01_sfnt_off00011bd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BD7 21044 bytes
SHA-256: 12e043fb8deea8cec272910c66756d5844345784de008cbfdb6c86014304dc57
font_02_sfnt_off000150bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x150BF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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